TBESG:ἄθλησιςstruggleG:N-F ἄθλησις, -εως, ἡ (< ἀθλέω), a contest, combat, esp. of athletes; fig., a struggle: Heb.10:32 (for exx., see MM, VGT, see word).† (AS)
ἀθλέω athleō ath-leh'-o From ἄθλος athlos (a contest in the public lists); to contend in the competitive gamesKJV Usage: strive.
συναθλέω sunathleō soon-ath-leh'-o From G4862 and G118; to wrestle in company with, that is, (figuratively) to seek jointlyKJV Usage: labour with, strive together for.